One of the major problems with an evaporative air cooler is an increase in humidity after some time of use and there is not much work is done on making it automatically operate. To overcome this problem an IoT-based Smart Evaporative air cooler with humidity control has been developed. In this paper, a method is introduced which maintains the humidity in the human comfort zone. An algorithm is developed by analyzing data from the dht22 humidity and temperature measurement sensor, in which instead of the pump operating continuously it operated intermittently. ESP8266 Wi-Fi module is used to connect it to the internet so that when you’ll be away from home you wanted a cool room you can turn on the water cooler before entering a home. Arduino Uno microcontroller with Atmega328P chip, Water Level Depth Detection Sensor for Arduino, and Relay is used. This system allows the user to control the Air cooler through a mobile phone very conveniently maintaining the humidity in the human comfort zone and operating it through a mobile phone.One of the major problems with an evaporative air cooler is an increase in humidity after some time of use and there is not much work is done on making it automatically operate. To overcome this problem an IoT-based Smart Evaporative air cooler with humidity control has been developed. In this paper, a method is introduced which maintains the humidity in the human comfort zone. An algorithm is developed by analyzing data from the dht22 humidity and temperature measurement sensor, in which instead of the pump operating continuously it operated intermittently. ESP8266 Wi-Fi module is used to connect it to the internet so that when you’ll be away from home you wanted a cool room you can turn on the water cooler before entering a home. Arduino Uno microcontroller with Atmega328P chip, Water Level Depth Detection Sensor for Arduino, and Relay is used. This system allows the user to control the Air cooler through a mobile phone very conveniently maintaining the humidity in the human comfort zone and operating it through a mobile phone.